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The senses of predators are adapted in a variety of ways to facilitatehunting behaviour. Visual acuity is great in raptors such as the red-tailed hawk, which soars on high searching for prey. Even on a dark night owls can hear, and focus on, the rustling sound and movement of a mouse. Many insect-eating bats hunt by echolocation, emitting a pulsed, high-frequency sound—in the manner of a ship’s sonar—while flying; the sensory data thus gained guides them to their prey. A flock of white pelicans will cooperate to form a semicircle and, with much flapping of wings, drive fish into shallow water where they are easily captured.

any member of the only group of mammal s capable of flight. This ability, coupled with the ability to navigate at night by using a system of acoustic orientation (echolocation), has made the bats a highly diverse and populous order. More than 1,200 species are currently recognized, and many are...